JP3578920B2 - Car seat back - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle seat back, and more particularly to a vehicle seat back structure for protecting an occupant's cervical spine when the vehicle is hit by a rear-end collision.
[0002]
[Prior art]
As a conventional seat back of such an automobile, as shown in International Patent Publication No. 98/09838, a seat back frame (9) and an upper end of the seat back frame (9) are supported so as to be rotatable forward and backward. A headrest (4), which is supported on the upper end of the support means (5) via a stay (27) so as to be vertically movable, and a lower end of the support means (5). A pressure receiving member (10) that is supported and can receive pressure on the occupant's back; and an operation link (12) rotatably supported by the seat back frame (9) and the pressure receiving member (10), respectively. And at least a pad disposed on the front side of the pressure receiving member (10).
[0003]
Therefore, for example, when the own vehicle is collided, an impact load acts on the seat back (3) toward the front side, and a reaction load by the occupant acts toward the rear side. That is, the load acts on the back element (20) and the pressure receiving member (10) provided between the seat back frames (9). At this time, the pressure receiving member (10) moves rearward, so that the support means (5) rotates about the upper side (24) of the seat back frame (9) as a rotation fulcrum, and is supported at the upper end thereof. The moved headrest (4) operates in a direction approaching the occupant's head.
[0004]
Therefore, even if the seat back (3) flexes rearward due to the recoil load of the occupant when the host vehicle collides, the headrest (4) instantaneously comes close to the occupant's head. Is reliably received by the headrest (4) to protect the occupant's neck.
[0005]
[Problems to be solved by the invention]
However, in such a conventional technique, when the headrest (4) is kicked by an occupant sitting behind the pressure receiving member (10) or when the headrest (4) moves forward, the support means (5) is moved backward. There is a possibility that it will protrude to the side, and there is a demand for improved rear seating comfort.
[0006]
The present invention has been made by paying attention to such a conventional technique, so that a load is not applied to the pressure receiving member from the rear side, and when the headrest moves in the front direction, the support means is moved to the rear side. The present invention provides an automobile seat back that does not protrude from the vehicle.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a seat back frame, a support means supported on an upper end of the seat back frame so as to be rotatable back and forth, and a headrest supported on an upper end of the support means. A pressure receiving member supported by the lower end of the support means and capable of receiving pressure on the back of an occupant; and an operation link formed by rotatably connecting the seat back frame side and the pressure receiving member side, respectively. And at least a pad arranged on the front side of the pressure receiving member. On the rear surface of the pressure-receiving member, the pressure-receiving member is capable of withstanding a load from the rear side and has a longitudinal cross-section that is formed in a shape along the pressure-receiving member, and a lower end portion thereof is formed in a curved shape. A protector is provided separately from the pressure receiving member.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Note that FR is described as a front side, RR is a rear side, UP is an upper side, and LWR is a lower side.
[0011]
1 to 10 show an embodiment of the present invention, wherein reference numeral 1 denotes an automobile seat back, and reference numeral 3 denotes a headrest.
[0012]
The seat back 1 includes a seat back frame 2, a pad 32 (see FIG. 4) formed of polyurethane foam disposed before and after the seat back frame 2 (see FIG. 4), and a skin made of cloth or the like covering the pad 32. And at least formed. Reference numeral 34 shown in FIG. 4 is an airbag device.
[0013]
The seat back frame 2 is formed in an inverted U-shape, and one is longer and the other is shorter (to secure an allowance for mounting the airbag device 34), and an upper frame 2a is formed. The side frames 2b, 2b 'have a substantially left-right symmetrical shape and are disposed at positions suspended from the left and right ends, and the underframe 2c is provided between the lower ends of the side frames 2b, 2b'.
[0014]
Each of the side frames 2b, 2b 'supports a bracket 5, 5' formed in a plate shape by an iron plate. One end portions 6a and 6a 'of the operating links 6 and 6' are supported by the brackets 5 and 5 'by bolts 20 and bushes 21 so as to be rotatable in the front and rear FR and RR directions, respectively. Between the other end portions 6b, 6b 'of the operation links 6, 6', ends 4a, 4a 'of the pressure receiving member 4 described later are rotatably supported by rivets 22 and bushes 21.
[0015]
Coiled springs 18, 18 are disposed between the spring hooks 23, 23 'of the side frames 2b, 2b' and the operating links 6, 6 ', respectively, and the other end of the operating link 6 is provided. The side 6b, 6b 'is always biased toward the front side FR.
[0016]
The pressure receiving member 4 is formed in a rectangular shape extending right and left by a rigid body such as an iron plate, and has a horizontal cross section formed as a flat central portion 4a and a slope on the front side FR as shown in FIG. Planar first side portions 4c, 4c 'disposed on the front side FR from the central portion 4a via first step portions 4b, 4b' formed from the first side portions 4c, 4c '. The second side portions 4e and 4e 'are formed in a substantially U-shape and are separated from the rear surface of the pad 32.
[0017]
That is, the shape of the cross section of the pressure receiving member 4 is the side frame of the seat back frame 2 such as the rearmost position (reference numeral 30c shown in FIG. 4) moved by the pressure of the back 30a of the occupant 30. 2b, 2b '.
[0018]
Further, the shape of the upper side of the vertical section located between the central portion 4a of the pressure receiving member 4 and, in particular, the holding portions 8 of the armature pipe 7 as supporting means described later is as shown in FIGS. , A slope portion 9 rising rearward.
[0019]
On the rear side of the pressure receiving member 4, a protector 31 made of synthetic resin and formed in a shape that covers the entire rear surface of the pressure receiving member 4 is arranged, and a clip 31 a of the protector 31 is formed on the pressure receiving member 4. The opening 4g is engaged and supported.
[0020]
The protector 31 is formed such that the pressure receiving member 4 can withstand a load from the rear side RR, for example, a rear seat occupant can withstand a load such as kicking the front seat, that is, the rear surface of the own seat. The pressure receiving member 4 is disposed on the pressure receiving member 4 itself at a position appropriately separated therefrom. Further, the longitudinal cross-sectional shape of the protector 31 is such that the upper end portion 31b is flanged up toward the pressure receiving member 4, the outline 31c is formed in a shape along the pressure receiving member 4, and the lower end portion 31d is formed in a curved shape. It becomes.
[0021]
Below the upper frame 2a, a second frame 28 spanned between the shoulders 2aa and 2aa 'of the upper frame 2a is supported by welding. The holder bracket 12 is disposed at the center of the second frame 28, and both ends 12a thereof are supported by welding. Armature holders 11, 11 made of synthetic resin are provided inside support portions 12b, 12b, which protrude forward at a position separated from the center of holder bracket 12 to the left and right and are formed in a U-shaped cross section. Be placed. Since the armature holders 11 are supported on the upper ends of the holding portions 8 of the armature pipe 7, the armatures are supported by the support portions 12b of the holder bracket 12 via the armature holders 11 and 11. The holding portions 8, 8 of the pipe 7 are held.
[0022]
The armature pipe 7 has vertical holding parts 8, 8 which are arranged side by side in a front view, and is formed at the lower end of the holding parts 8, 8 and is crushed back and forth on the rear surface of the pressure receiving member 4. It is formed in a substantially U-shape with the folded portion 10 having a cross section and supported by gas welding.
[0023]
The holding parts 8, 8 are arranged at least on the center side from the shoulder point of the AF05% tile mannequin (SAE) in a front view. The arrangement of the AF 05% tile mannequin (SAE) on the center side of the shoulder point means that the holding parts 8, 8 are arranged inside the shoulder points of most of the occupants 30 of the adult physique. Therefore, even if the occupant 30 receives a load from the front side of the seat back frame 2 due to the rear-end collision of the vehicle, the shoulder of the occupant 30 does not interfere.
[0024]
In addition, the holding portions 8 are formed in a front and rear “U” shape so that the pressure receiving member 4 is disposed on the front side of the holding members 8 in the side view shown in FIG. . The bent portion 8a is formed at a position where the bent portion 8a does not interfere with the lower end of the stay 13 of the headrest 3, and has an inner surface having a radius of 20 mm.
[0025]
As described above, the stays 13, 13 of the headrest 3 are supported in the holding portions 8, 8 via the armature holders 11, 11 made of synthetic resin so as to be slidable up and down. Headrest holders 14, 14 capable of controlling the vertical positions of the stays 13, 13 are held at the upper end portions of the holding portions 8, 8. Reference numeral 14a (not shown) denotes an engaging portion of the headrest holders 14, 14, and reference numeral 15 denotes a frame of the headrest 3.
[0026]
Reference numeral 16 denotes an S-shaped spring supported by the side frames 2b and 2b 'via hooks 17 and 17', and is disposed below the pressure receiving member 4.
[0027]
An opening 19 is formed in the rear surface of the holding portion 8. When a tool such as a screwdriver is pushed into the opening 19, a not-shown engagement member engaged with the opening 19 of the headrest holders 14, 14 is formed. This is a structure in which the joint portion is pushed and detached from the opening portion 19, and can be pulled out from the holding portions 8, 8. That is, the headrest holders 14 and 14 can be locked off.
[0028]
Reference numeral 24 denotes a stopper rubber, and reference numeral 25 denotes a backboard hook frame.
[0029]
Next, the operation according to this embodiment will be described.
[0030]
As shown in FIG. 1, in a normal state in which the occupant 30 sits on the seat cushion 27 of the seat 26 and leans the back 30 a against the seat back 1, there is no space between the head 30 b of the occupant 30 and the headrest 3. There is a slight gap A, and a slight gap B is formed between the back 30a of the occupant 30 and the pressure receiving member 4. Although a pad 32 and a skin (not shown) are interposed between the back 30 a of the occupant 30 and the pressure receiving member 4, the load from the occupant 30 is not applied to the pressure receiving member 4.
[0031]
In this state, the pressure receiving member 4 is formed of a rigid body such as an iron plate, and has a substantially U-shaped cross section and is separated from the rear surface of the pad 32. The presence of the pressure receiving member 4 is not given through the pad 32 until a load is generated in the side RR direction. That is, the occupant 30 is not given a foreign-body sensation.
[0032]
On the rear surface of the pressure receiving member 4, a protector 31 capable of withstanding the load from the rear side RR is disposed at a distance from the pressure receiving member 4, so that the protector 31 is separated from the rear side RR by the rear passenger. Even if the load on the front FR is applied to the protector 31, a load such as kicking from the rear seat is not transmitted to the pressure receiving member 4 regardless of the position of the pressure receiving member 4, so that the pressure receiving member 4 is moved to the front side. Cannot move to FR. That is, the safety of the occupant 30 is further ensured.
[0033]
In addition, the holding portion 8 is formed in a “<” shape on the front side with respect to the pressure receiving member 4, and the rear surface of the folded portion 10 is covered by the protector 31. When the pressure receiving member 4 is moved to the FR, that is, when the pressure receiving member 4 moves to the rear side RR as shown in FIG. 5, the pressure receiving member 4 and the folded portion 10 do not protrude to the rear side RR. That is, the safety of the rear seat occupant is further ensured.
[0034]
Since the protector 31 is held by the pressure receiving member 4, the distance between the protector 31 and the pressure receiving member 4 is fixed, and tuning to the load from the rear side RR is easy. That is, the distance between the two can be increased or decreased depending on the load value.
[0035]
The vertical cross-sectional shape of the protector 31 is roughly the same as the shape 31c of the pressure receiving member 4, and the lower end 31d is formed in a curved shape, so that the holding portion of the armature pipe 7 supporting the headrest 3 is provided. Even if the lower ends of 8, 8 protrude to the rear side RR, the lower end 31d is formed in a curved shape, so that the safety of the rear seat occupant is further maintained.
[0036]
When the own vehicle is collided and the seated occupant 30 is pushed by the rear side RR due to the secondary collision and the pad 32 or the like of the seat back 1 moves to the rear side RR, the back 30a of the occupant 30 passes through the pad 32 or the like. The pressure receiving member 4 is pushed to the rear side RR. Even if the pad 32 or the like moves rearward due to the load in the rear RR direction by the occupant 30, the load in the rear RR direction by the back 30a of the occupant 30 is reduced because the pressure receiving member 4 receiving the load is rigid. It is transmitted to the headrest 3 reliably. That is, the headrest 3 moves immediately when a load is applied to the pressure receiving member 4, so that there is no timing loss. In addition, the amount of movement of the pressure receiving member 4 increases.
[0037]
Then, with respect to the movement of the holding portion 8 of the armature pipe 7 that rotates to move to the upper side UP due to the load on the rear side RR, the load point of the pad 32 disposed at the position opposed to at least AF05 The pad 32 and the like do not bite into the holding portion 8 of the armature pipe 7 because the shoulder point is determined by the% tile mannequin. For this reason, the rise due to the rotation of the holding unit 8 is not hindered, and the operation amount of the headrest 3 can be sufficiently secured.
[0038]
The operating link 6 supporting the pressure receiving member 4 is rotationally urged about the bolt 20, and the other end 6b of the operating link 6 is moved from the position shown in FIG. 1 to the position shown in FIG. Then, the other end 6b of the operation link 6 is rotated about the bolt 20 in the direction of the upper side UP and the rear side RR.
[0039]
Thus, when the other end 6b of the operation link 6 rotates to the upper side UP and the rear side RR, the lower end of the armature pipe 7, that is, the folded portion 10 moves to the upper side UP and the rear side RR. Along with the movement, the headrest holders 14, 14 together with the upper end of the armature pipe 7, that is, the upper ends 8b, 8b of the holding portions 8, 8, move to the upper side UP and the front side FR. By this movement, the stay 13 of the headrest 3 is also moved to the upper side UP and the front side FR.
[0040]
Therefore, the holding portions 8 and 8 and the stays 13 and 13 move together around the holder bracket 12. The headrest 3 supported by the stays 13 contacts the head 30b of the occupant 30, as shown in FIG. In FIG. 5, the headrest 3 is illustrated as biting into the head 30b of the occupant 30, but the center of the headrest 3 is depressed, and the head 30b of the occupant 30 also has a cross section as is well known. It is not a bite because it is almost cylindrical.
[0041]
In this manner, the head 30b of the occupant 30 that is left behaving as the upper body of the occupant 30 moves to the rear side RR is reliably held by the movement of the headrest 3. At this time, since the inclined surface 9 rising to the rear side RR is formed on the upper side of the pressure receiving member 4, the inclined surface 9 of the pressure receiving member 4 can move smoothly along the rear surface of the pad 32. In other words, it is difficult for the pressure receiving member 4 to bite into the pad 32.
[0042]
In this state, the cross section of the pressure receiving member 4 is at the rearmost position moved by the pressure of the back 30a of the occupant 30, and as shown in FIG. 'Will not interfere.
[0043]
Further, when a tool such as a screwdriver is pushed into the opening 19 on the rear side of the holding portion 8, the engaging portion (not shown) engaged with the opening 19 of the headrest holders 14, 14 is pushed to open the opening. 19, and can be pulled out of the holding portions 8, 8. That is, the headrest holders 14 and 14 can be locked off.
[0044]
Further, since the stays 13, 13 of the headrest 3 are vertically movably supported by the headrest holders 14, 14, the headrest 3 can be appropriately adjusted to the position of the head 30b of the occupant 30.
[0045]
Also, a spring 18 for urging the pressure receiving member 4 toward the front side FR is supported between the operation link 6 and the side frame 2b of the seat back frame 2, so that the occupant 30 can be moved backward by the back 30a. When no pressing force is applied to the side RR, the pressure receiving member 4 is in the front side FR by the spring 18. That is, the headrest 3 supported on the upper ends of the holding portions 8, 8 of the armature pipe 7 supporting the pressure receiving member 4 on the lower end is settled at the rear RR position according to the seesaw principle, thereby impairing the occupant's 30 livability. Nothing.
[0046]
The armature pipe 7 is not limited to the embodiment in which the holding portions 8, 8 and the folded portion 10 form a U-shape. For example, without the folded portion 10, the lower end portions of the holding portions 8, 8 receive pressure. It may be supported by the member 4 by welding.
[0047]
In the above description of the operation, it is assumed that the head 30b of the occupant 30 is securely held by the movement of the headrest 3, but the movement of the headrest 3 and the movement of the seat back 1 are relative to each other. Even if the seat back 1 is moved to the rear side RR by the back 30a of the occupant 30, the headrest 3 does not move with respect to the head 30b of the occupant 30, and is held at that position, so that the head 30b of the occupant 30 is moved. It also includes those described as protected.
[0048]
【The invention's effect】
According to the first aspect of the present invention, a protector capable of withstanding the load from the rear side is provided on the rear surface of the pressure receiving member at a distance from the pressure receiving member. Even if a load is applied from the rear side by the occupant, the pressure receiving member cannot be moved to the front side. That is, the safety of the occupant in the seat is further ensured.
[0049]
Further, even if the headrest is moved to the front side, that is, even if the pressure receiving member is moved to the rear side, the support means of the headrest is prevented from protruding to the rear side. That is, the safety of the rear seat occupant is further ensured.
[0050]
Further , since the protector is held by the pressure receiving member, the interval between the protector and the pressure receiving member is fixed, and tuning to a load from the rear side is easy. That is, the distance between the two can be increased or decreased depending on the load value.
[0051]
Further , the vertical cross-sectional shape of the protector is roughly formed along the pressure receiving member and the lower end thereof is formed in a curved surface, so that the lower end of the support means of the headrest projects rearward. Also, by being formed in the curved shape, the safety of the rear seat occupant is further maintained.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a seat back according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of FIG.
FIG. 3 is a perspective view showing a main part of FIG. 1;
FIG. 4 is a sectional view taken along the line SA-SA of FIG. 1;
FIG. 5 is an enlarged explanatory view showing an attached state of the protector of FIG. 1;
FIG. 6 is a front view of the pressure receiving member and the protector according to arrow B of FIG. 4;
FIG. 7 is a sectional view taken along the line SC-SC in FIG. 6;
FIG. 8 is a sectional view taken along the line SD-SD in FIG. 6;
FIG. 9 is a sectional view taken along the line SE-SE of FIG. 6;
FIG. 10 is a sectional view showing the operation embodiment of FIG. 1;
[Explanation of symbols]
Reference Signs List 1 seat back 2 seat back frame 2a upper frame 2b of seat back frame side frame 3 of seat back frame 3 headrest 4 pressure receiving member 6 operating link 6a one end 6b of operating link 7 other end of operating link 7 armature pipe 8 as support means Armature pipe holding section 10 Armature pipe folding section 13 Headrest stay 29 Backboard trim bracket 30 Occupant 30a Occupant's back 30b Occupant's head 31 Protector FR Front RR Rear UP Upper LWR Bottom

Claims (1)

A seat back frame, supporting means rotatably supported at the upper end of the seat back frame so as to rotate back and forth, headrest supported at the upper end of the supporting means, and support at the lower end of the supporting means. A pressure-receiving member that is capable of receiving pressure on the back of the occupant, an operation link in which the seat back frame side portion and the pressure-receiving member side portion are rotatably connected to each other, and a pressure-receiving member that is disposed in front of the pressure-receiving member. In a seat back for an automobile comprising at least a pad and
On the rear surface of the pressure-receiving member, the pressure-receiving member is capable of withstanding a load from the rear side and has a longitudinal cross-section that is formed in a shape along the pressure-receiving member, and a lower end portion thereof is formed in a curved shape. A seat back for an automobile, wherein a protector is disposed separately from the pressure receiving member.

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